Railway air-brake.



' 'PATENTBD AUG. 11, 1 03.

.P. JAGOBSON. RAILWAY AIR BRAKE. APPLIQATIOH FILED MAI 1 8, 1908.

2 nnn'rs-snsm 1.

N0 MODEL.-

v PATENTED AUG.. 11, 19m P. JAGOBSON. RAILWAY AIR BRA-KB. APPLIOATION FILED MAY ya, 1903.

Z SHEETS S HBET 2- No MODEL.

UNITED STATES PETER JAOOBSON, or MILWAUKEE, Wisconsin.

RAIL'WAY AIR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 735,981, dated August 11, 1903.

Application filed May 18, 1903. Serial No. 157,514. (No model.)

To all whom it may concern.-

Be it known that I, PETER JACOBSON, a cit-i zen of the United States, and a residentof following isa full, clear, and exact description thereof.

My invention consists in certain peculiarities of construction and combination of parts hereinafter particularly set forth with reference to the accompanying drawings and subsequently claimed, the object of said invention being to provide simple, economical, and efficient automatic slack-adjusters for airbrakes of railway-cars.

Figure 1 represents a plan view of air-brake mechanism, partly in horizontal section and organized in accordance with my invention for automatic slack adjustment; Fig. 2,. a partlysectional view of a portion of the mechanism, this view being indicated by line 2 2 in the firstfigure; Fig. 3, an elevation of a detail of the mechanism, partly in section, Fig. 4, a View indicated by line 4 4 in said first figure; Fig. 5, a sectional view of an automatic take-up-lever coupling that constitutes a detail of the mechanism, and Figs. 6 and 7 partly-sectional views that are respectively'indicated by lines 6 6 and 7 7 in the fifth'figure.

Referring by letter to the drawings, A indicates a railway air-brake cylinder, 13 the arerespectively in pivotal connection with cross-head of the piston that plays in the cylinder, and O D the connected brake-rods that H, engaged by a pawl I, in pivotal suspension in a rocker comprising a pair of plates J K,

loose on said sleeve and connected by upper :and lower bolts. The upperbolt is the pawlpivot, and a spacer b is arranged on the lower bolt between the, plates.

Loose in-an eye in an upwardly-extending portion of the rocker-plate J .is the curved and rounded end of an otherwise angular lever L, fulcrumed on -a pivot a between a suspended bracket M and an angular strap (1, that is bolted on the bracket. The other end of the lever L has play in a suspended bracket N and is bolted to a right-angle plate P, that is longitudinally slotted to be adjustable on the connecting-bolt. Adjustably held in the offset end of the plate P by set-nuts e, opposing opposite sides of this end of' the plate, is a screw-pin Q, having a head in connection with a chain R, an end link f of which is fitted on an extension of thepivot-pin g,that. couples the brake-rod lever I) with the piston cross-head B, the aforesaid plate being in the path of said pin.

In practice the adjustment of the plate P and pin Q determines the initial play of the piston in cylinder A, the adjustment being such that said plate will not be affected by the pivot-pin or striker g until there is Wear of brake-shoes due to running application of the brake. There being wear of the brake-shoes, outward movement of the brakcepiston results in an impact of the pivot-pin or striker r against the plate P and a swing of the lever L, whereby when there is sufficient wear of said shoes the rocker aforesaid is moved far enough to cause the pawll' to slip back in another notch of the ratchet-wheel II, that is rigid with the sleeve E aforesaid. As a result of this operation there will be rotary movement of said sleeve when the piston and lever L return to normal position on release of the brake, whereby the connection between the lovers 0 I) is shortened to compensate for the slack that results from the wear of brakeshoes. This automatic compensation for brake-shoe weantakes place from time to time as the frequeneyof rimnifig' application of the brake mechanism may necessitate." llence predeterminedpisfiomplay in the Make cylinder is alwai s approximately the same, the

variation at 1 nytnne being too slight to affect the efliciency ofi'said brake meehanism.

It C1 W i as:

to be actuated by said cross-head or a striker therewith when the brake-piston has greater than predetermined outer strolge.

2. A. railway-car air-brake mechanism coinprising stems in pivotal connection with brake-rod levers, a sleeve having stuffing-box ends and right and left screw-thread connection with the stems, a ratchet-wheel rigid on the sleeve, a'roclger loose on said sleeve, a

pawl carried by tfierocker and engaged with the ratchet-wheel, a lever in connection with said rocker, an angle-plate having adj ustable, union with the rocker-lever in theou'tward path of the piston cross-head of said mechanism or a striker therewith,,and an adjustable flexible connection between said plate and crosshead.

A railway-car air-brake mechanism comprising stemsin pivotal connection with brake-rod levers, a sleeve having stuffing-box ends and right and left screw-thread connection with the stems, a ratchet-wheel rigid on the sleeve, a rocker loose on saidsleeve, a pawl carried by-the rocker and engaged with the ratchet-wheel, a lever in connection with said rocker, a right-angle plate having a 1ongitudinal slot engaged by a boltin connection with the rocker-lever, this plate being in the outward path of the piston cross-head of said mechanism or a striker therewith, a chain in connection with said cross-head, a screwthreaded pin with the chain engaging the on? set end of said plate, and nuts run on the pin to hold the same in ajdjusted position.

v 4;. A railway-car air-brake mechanism comprising a turn bu ckle-cou plin g between brake rod levers, a ratchet-wheel. in rigid connection with the turnbuckle, a rocker loose on said turnbuckle, a pawl carried by the rocker and engaged with the ratchet-wheel, an angular lever having curved end loose in a rocker eye, and a flexible connection between the otherend of the rocker-lever and the piston cross head of said mechanism, said rockerlever being arranged to be actuatedby said cross-head or a striker therewith when the brake-piston has greaterthan predetermined outer stroke A v i 5, A railway-car air-brake mechanism (30111- prisinga turnbuckle-coupling between brakerod levers, a ratchetovheeliu rigid connection with the turnb'uckle, a rocker loose on said turnbuckle, a pawl carried by the rocker and engaged with the ratchet vheel, an angular lever having a curved end loose in a rockerye, a right-angle plate in connectionwith .the other end of the rockerdever, in theoutward path of an extension of the pivot-pin connecting the piston cross-head of said mechanism with oneof said brake-rod levers, v

and means by which the offset end. of said plate and pivot-pin are put in adjustable flexible connection. i

In testimony thatI claim the foregoing I have hereuntoset my hand, at Milwaukee, in the county of Milwaukee and State of Wisconsin, in the presence'of two witnesses.

4 PETER JACOBSON.

, \yitnesses:

N. E. OLIPHANT,

E. W. HELLER. 

